Pumping-rig.



J. P. COFFMAN.

PUMPING RIG.

APPLICATION FILED DEC. 14, I914.

Patented July 13, 1915.

1 1Q6AQQO A TTORNE Y JOSEPH P CUFF/WAN WITNESSES.-

Y r as PATENT sumo.

JOSEPH P. COFFMAN, OF RENO, PENNSYLVANIA, ASSIG-NOR T NATIONAL TRANSITCOMPANY,.OF OIL'GITY, PENNSYLVANIA, A CORPORATION 012" PENNSYLVANIA.

PUMPING-me.

Specification of Letters Patent.

Patented July is, 1915.

Application filed December 14, 1914. Serial No. 877,114.

To all whom itimay concern:

Be it known that I, J OSEPH P. GOFFMAN, citizen of the United States,residing at Reno, in the county of Venango and State of Pennsylvania,have invented certain new and useful Improvements in Pumping-Rigs,"

of which the following is a specification.

My invention relates to improvements in pumping rigs for deep wells, andmore parary to employ a walking-beam in some one of its various modifiedforms to actuate the pumping-mechanism, and in all such cases,-

. so far as applicant is aware, all of the presout forms of beams have,at their respective ends, the arcuate line of movement which ischaracteristic of all levers having a fixed fulcrum point.

That portion of the pumping-mechanism to which the actuating end of thebeam is attached, is an extension of the sucker-rod, and this extensionis termed the polishedrod,so termed because it is finished or polishedto adapt it to reciprocate with a minimum amount of friction through astuffing-box that forms the upper termination of the well-tubing,through which the fluid is pumped from the well. Unless saidpolished-rod is actuated in a straight, vertical line, which coincideswith its longitudinal axis,-that is to say, its true, normal line oftravel-1ts movement through said stuffing-box will be cramped, thusconsummg an excessof power to actuate the same, and said box, andthe'packing within the same will become worn and ineflicient, permittinga leakage and waste of oil through the same.

It is, therefore, the object of this inven tion, to provide 'apumping-rig comprising a walking-beam, so constructed and mounted, thatthe pumping-end thereof, at the point at which it is attached to saidpolished-rod, will be caused to travel in a straight vertical line whichcoincides with the longitudinal axis of said rod, and its normal line ofmovement, and wherein the objectionable arcuate line of movement of saidpoint of attachment is eliminated.

One form of construction whereby my inventive idea may be mechanicallyembodied is shown in the drawings which form a portion of thisspecification. These drawings are, in several respects merelyillustrative, however, and I do not wish to be understood as confiningthe embodiment of my invention to the precise form of construction ahdcombination of elements there shown, as va- I'lOllS mod1ficat1ons,-asWlll be herelnafter pointed out c0uld be employed without de-' partingfrom the scope of my invention.

In said drawings: Figure 1 is a plan View of a pumping rig constructedin accordance with my invention. Fig. 2 is a side elevation of same.

The construction here illustrated is substantially as follows: Within asuitable frame-work 1, is mounted a vertically-extending rocker-arm 2,the upper end of which is formed into suitable bearings for thereception of the fulcrum-trunnions 3 of a walking-beam 4, and whichbearings said beam is adapted to oscillate vertically. Through themedium of said rocker-arm 2, said beam is adapted to have, in additionto its vertically-oscillative movement, a longitudinally-oscillativemovement: said longitiudinal oscillations are of such extent as to causethe pumping end 4- of said beam 4, at

the point whereit is attached to the polished-rod 7, to travel in astraight line which is co-incident with the longitudinal axis ofsaidrod; said longitudinally-oscillative;

movement is secured in the following manner: said frame 1 is providedwith a rigid, upwardly-extending arm 5, the upper end of which ispositioned in close proximity to one side of said beam 4, and at a pointintermediate thetrunnions 3 and the pum end 4' of said beam. 'To-theextremity 0 said arm is pivotally attached one end of ahorizontally-extending link or secondary rockerarm 6. The other end ofsaid link is attached to said walking-beam at a point intermediate thepivotal point of said link and the trunnions 3, or fulcrum point of thebeam. When said beam is caused to oscillate vertically, the swinging endof said link 6, which is attached to said beam, is caused to move on thearcuate line A, and this causes said beam 4 to have a degree oflongitudinal oscillation which is just sufiicient to cause theconnecting point of the beam with the polished rod, to move in astraight, vertical line, coincident with the normal line of travel ofsaid polished-rod.

I have shown certain means whereby beam 4 may be vertically oscillated,which means consists of acrank-wheel 8, shown as a spurgear, driven by apinion 9, to the shaft 10 of which is secured a belt-wheel 11 to whichpowermay be transmitted by means of a belt from any suitable source ofpower; a pitman 8 serves to transmit motion from said crankwheel 8'tosaid walking-beam. Any other suitable means may be employed foroperating said walln'ngv-beam, such, for instance, as

7 one of the well-known forms of pumpingjack, and this, in turn may beoperated by any suitable method now commonly em-. ployed. A suitableclamp 12 is provided upon the end 4: of said beam 4, for the engagementofg the polished -'rod-clamp 13, commonly termed the adjuster. The free,

rearward end of said beam 4 is providedwith a counter-weight 1 1,adapted to counter-balance the weight of the actuated pumping mechanism.

I claim the following:

A pumping rig comprising in combination, a base or frame 1 having anupwardlyextending arm 5, a verticallyextending rocker-arm 2 mounted atits lower end in said base,a walking beam 4 pivotally mounted at theupper end of said rocker-arm, a

clamp, as 12, positioned at one end of said beam adapted for theoperable engagement of the pumping mechanism 7 of a well, a link 6secured at one end thereof to said arm 5 and at the other end to saidwalking-beam for the purpose set forth, a counterweight 14 carried bysaid beam adapted to counterbalance the weight of the actuated pumpingmechanism 7, and suitable gearing, as the combination 11, 9, 8 and 8also mounted in said base or frame for imparting oscillation to saidbeam.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH P. COFFMAN.

Witnesses:

MERRILL I-I. LILLY, CLIFFORD KAHLE.

